Hello World

mkdir hello-mcp && cd hello-mcp
npm init -y
npm install @modelcontextprotocol/sdk zod

// Save as index.js
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import { z } from "zod";

const server = new McpServer({
  name: "hello-world-server",
  version: "1.0.0",
});

// Simple greeting tool
server.tool(
  "greet",
  "Greet a user by name",
  {
    name: z.string().describe("The name to greet"),
  },
  async ({ name }) => ({
    content: [{
      type: "text",
      text: `Hello, ${name}! Welcome to MCP! 👋`,
    }],
  })
);

// Tool with no parameters
server.tool(
  "hello",
  "Say hello to the world",
  {},
  async () => ({
    content: [{
      type: "text",
      text: "Hello, World! 🌍",
    }],
  })
);

const transport = new StdioServerTransport();
await server.connect(transport);

// Add to claude_desktop_config.json
{
  "mcpServers": {
    "hello-world": {
      "command": "node",
      "args": ["path/to/hello-mcp/index.js"]
    }
  }
}